DOCS-28118 - Remove empty promo codes

[joel-hamill]

Description

Remove empty content from the following topics: https://docs.confluent.io/cloud/current/get-started/examples/ccloud/docs/replicator-to-cloud-configuration-types.html#ccloud-promo-code https://docs.confluent.io/cloud/current/get-started/examples/ccloud/docs/ccloud-stack.html#ccloud-promo-code https://docs.confluent.io/cloud/current/get-started/examples/cloud-etl/docs/index.html#ccloud-promo-code

• related PR https://github.com/confluentinc/examples/pull/1201/files

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